feat: Introduce advanced TLS client with browser fingerprinting and new backend modules for API processing, authentication, mail, and ChatGPT registration.

backend/internal/mail/service.go

@@ -2,6 +2,7 @@ package mail
 
 import (
 	"bytes"
+	"context"
 	"encoding/json"
 	"fmt"
 	"math/rand"
@@ -355,7 +356,13 @@ func (m *Client) GetEmails(email string, size int) ([]EmailItem, error) {
 
 // WaitForCode 等待验证码邮件
 func (m *Client) WaitForCode(email string, timeout time.Duration) (string, error) {
-	start := time.Now()
+	ctx, cancel := context.WithTimeout(context.Background(), timeout)
+	defer cancel()
+	return m.WaitForCodeWithContext(ctx, email)
+}
+
+// WaitForCodeWithContext 等待验证码邮件（支持 context 取消）
+func (m *Client) WaitForCodeWithContext(ctx context.Context, email string) (string, error) {
 	// 匹配6位数字验证码
 	codeRegex := regexp.MustCompile(`\b(\d{6})\b`)
 	// 专门匹配 OpenAI 验证码邮件标题格式: "Your ChatGPT code is 016547" 或 "OpenAI - Verify your email"
@@ -381,7 +388,12 @@ func (m *Client) WaitForCode(email string, timeout time.Duration) (string, error
 		}
 	}
 
-	for time.Since(start) < timeout {
+	for {
+		select {
+		case <-ctx.Done():
+			return "", fmt.Errorf("验证码获取超时")
+		default:
+		}
 		emails, err := m.GetEmails(email, 10)
 		if err == nil {
 			for _, mail := range emails {
@@ -435,10 +447,12 @@ func (m *Client) WaitForCode(email string, timeout time.Duration) (string, error
 				}
 			}
 		}
-		time.Sleep(1 * time.Second)
+		select {
+		case <-ctx.Done():
+			return "", fmt.Errorf("验证码获取超时")
+		case <-time.After(1 * time.Second):
+		}
 	}
-
-	return "", fmt.Errorf("验证码获取超时")
 }
 
 // WaitForInviteLink 等待邀请邮件并提取链接
@@ -520,11 +534,22 @@ func GetLatestEmailID(email string) int {
 // GetEmailOTPAfterID 获取指定邮件ID之后的OTP验证码
 // 基于 get_code.go 的实现，只获取 afterEmailID 之后的新邮件中的验证码
 func GetEmailOTPAfterID(email string, afterEmailID int, timeout time.Duration) (string, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), timeout)
+	defer cancel()
+	return GetEmailOTPAfterIDWithContext(ctx, email, afterEmailID)
+}
+
+// GetEmailOTPAfterIDWithContext 获取指定邮件ID之后的OTP验证码（支持 context 取消）
+func GetEmailOTPAfterIDWithContext(ctx context.Context, email string, afterEmailID int) (string, error) {
 	client := NewClientForEmail(email)
-	start := time.Now()
 	codeRegex := regexp.MustCompile(`\b(\d{6})\b`)
 
-	for time.Since(start) < timeout {
+	for {
+		select {
+		case <-ctx.Done():
+			return "", fmt.Errorf("验证码获取超时 (afterEmailID=%d)", afterEmailID)
+		default:
+		}
 		emails, err := client.GetEmails(email, 5)
 		if err == nil {
 			for _, mail := range emails {
@@ -554,8 +579,10 @@ func GetEmailOTPAfterID(email string, afterEmailID int, timeout time.Duration) (
 				}
 			}
 		}
-		time.Sleep(1 * time.Second)
+		select {
+		case <-ctx.Done():
+			return "", fmt.Errorf("验证码获取超时 (afterEmailID=%d)", afterEmailID)
+		case <-time.After(1 * time.Second):
+		}
 	}
-
-	return "", fmt.Errorf("验证码获取超时 (afterEmailID=%d)", afterEmailID)
 }